Watch crown clamping chuck



F. A. SMITH ETAL WATCH CROWN CLAMPING CHUCK Filed Sept. 23, 1948 Aug. 1, 1950 2,517,043

VJ? llllll/wllllllmz= INVENTORS FREDERIC A. SMITH ZJoRG/|\| FLUGSTAD BY '//77 ATTORNEYS Patented Aug. 1, 1950 WATCH CROWN 'CLAMPING CHUCK Frederic A. Smith and J orgen Flugstad, Milwaukee, Wis.

Application September 23, 1948, Serial No. 50,788

Our invention refers to chucks for securing a watch crown to its associated stem.

The object of our invention is to provide a bored chuck barrel having a tapered mouth for the reception of a correspondingl tapered head centrally apertured and having a sleeve extension slidably mounted in the barrel. The inner end of the sleeve is internally threaded for threaded engagement with a rotatable hand actuated spindle, journaled in the barrel, whereby a watch crown hub and its associated threaded sleeve are compressed to permanently secure said crown to its associated stem. Thus the repair job is quickly completed at a saving of material time.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the novel construction, combination and arrangement of parts, substantially as hereinafter described, and more particularly defined by the appended claim, it being understood that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claim.

In the accompanying drawings is illustrated one complete example of the physical embodiment of the present invention constructed ac cording to the best mode so far devised for the practical application of the principles thereof.

In the drawings:

Fig. 1 represents a sectional elevation of a Watch crown clamping chuck embodying the features of my invention, the section being indicated by line l| of Fig. 3.

Fig. 2 is a similar fragmentary sectional view of the barrel portion of the chuck illustrating the associated mechanism in full.

Fig. 3 is a cross section of the chuck, the section being indicated by line 3-3 of Fig. 1.

Fig. 4 is a fragmentary end view of the chuck, the same being indicated by section line 44 of Fig. 1.

Fig. 5 is another cross sectional view, the section being indicated by line 5--5 of Fig. 1.

Fig. 6 is another cross sectional view, the section bein indicated by line 6-8 of Fig. 1.

Fig. 7 is a further sectional view through the chuck barrel, the plan of the section being indicated by line 1--1 of Fig. 1.

Fig. 8 is a combined view of a standard watch stem and crown separated therefrom, the crown being in section.

Fig. 9 is a side elevation of the crown and stem assembled.

1 Claim. (Cl. 27953) Fig. 10 is a cross sectional view through the crown hub and stem, prior to these parts being compressed, the section being indicated by line l0i0 of Fig. 9; and

Fig. 11 is a similar sectional view after the crown hub has been compressed upon the threads of the stem.

Referring by characters to the drawings, I indicates a fixed centrally bored chuck barrel hav ing a pair of spaced bearings at its rear end and a third bearing at its front end, the mouth of said bar-rel being formed with an outwardly tapered receiving wall 2, having the mouth of said barrel provided with an outwardly tapered receiving wall 2.

For anchoring the chuck barrel, the same has extended downwardly therefrom a supporting web I having an inwardly extended flange 1", which flange is adapted to rest upon the surface of a work bench A, while the bottom end of the web abuts the edge of said bench and is secured thereto by a screw 3, whereby the tool is firmly anchored.

Slidably mounted in the bore of the barrel is a sleeve 4', terminating at its outer end with a centrally apertured tapered head 4 and said sleeve, with its associated head, is radially split through the head and a portion of the length of said sleeve, as indicated by the numeral 5, the various splits radiating from the central aperture of the head, whereby crown biting jaws are formed.

The inner end of the sleeve 4 is exteriorly threaded for the reception of a threaded socket 6 formed in the end of a spindle 1, which spindle is journaled in the barrel bore and its outer end has secured thereto an actuating wheel I, the hub of which engages the end face of the barrel, as shown.

The sleeve 4 is also provided with an exterior slot 4" adapted to receive a key-pin 8 which is carried by the barrel, whereby the sleeve is splined to the barrel and capable of nonrotatable and a longitudinal sliding movement, with reference to the barrel, but is held against rotation therein.

Thus, as best indicated in Fig. 1 of the drawings, when the chuck members are assembled, the threaded spindle 1 engages the threaded inner end of the sleeve 4, whereby said sleeve, upon actuation of the spindle, is moved back and forth in its fixed bearings in alignment with the bearings carrying the spindle, whereby said spindle is held against wobbling relative to the aligned sleeve and contracted or expanded.

As best illustrated in Figs. 8 to 11 inclusive, when it is desired to secure a watch crown B to its associated stem C, the internally threaded hub B of the crown is adjusted to the threaded end C of the stem, and thereafter the connected stem and crown are inserted into the biting jawed aperture of the sleeve head 4', whereby the hub of the crown is nested within the biting jaws of said head 'and vthe stem TC is extended into the sleeve.

To complete the job, all that is required is that the artisan manually rotates the spindle, whereby the sleeve 4 is drawn inwardly causing the jaws of the head to contract and "forcibly bite the hub B of thercrown, whereby saidihub is compressed and secured to the threaded end of the stem. It is understood that when this compression action takes place, as "best shown in Fig. 11 of the drawings, the hub is slightly contracted and will develop ridges D upon its face due to .the radially disposed vsplits in @therconicalfaced head.

We-claim: A chuck tool for watch .repairs, comprisingla fixed board barrelhhavingua webs extending .therefrom secured toa workbench, .the barrelbeing provided with a pair of spaced bearings at its rear end and an elongated aligned front bearing, the frontbearing terminating lwithtan outwardly 4 flared tapered seat, a non-rotatlve tapered head sleeve slidably mounted in the elongated barrel bore, the sleeve head engaging the tapered mouth of said barrel and being provided with a centrally apertured crown biting jaw, the said head end of the sleeve being radially split longitudinally for a portion of its length and having an exteriorly threaded reduced inner end extending beyond the frontbearing, a wheel carried spindle journaled in the pair of rear barrel bearings, the said spindle having a screw thread- 'ed socket engaging the threaded end of the ..sleeve, whereby .the same is longitudinally shifted back and forth in alignment with the head sleeve nwhereby due to the long bearing relative wobble between said spindle and sleeve is eliminated.

FREDERIC A. SMITH. JORGEN FLUGSTAD.

v REFERENCES CITED The following references are of recordin the .file of this patent:

UNITED STATES PATENTS 

